Riveting-machine.



PATENTED JULY 14; 19033 G. E., MARTIN. l RIVET'ING MACHINE.

- APPLIOATIQN FILED AUG. 14, 1902..

2 SHEETS-SHEET l.

PTENTED JULY 14,1903.

G. E. MARTIN. RIVBTING MACHINE.

APPLICATION FILED AUG. 14, 1902.

I 2 SHEETS-slum z.

NO MODEL.

No. 'rsa-197". raten-tea .iuiy 14, 196e.

UNrrEn STATES PATENT OFFICE.

GEORGE E. MARTIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE PEDRICK AND AYER COMPANY, OF PLAINFIELD, NEW JERSEY.

RIVETING-MACHIN.

SPECIFICATION forming part of Letters Patent No. 733,497, dated July 14, 1903. Application filed August 14, 1902. Serial No. 119,610. (No model.)

To @ZZ whom it may concern: piston; Fig. 3, an end view in section through Be it known that I, GEORGE E. MARTIN, a the valve-chamber; and Fig. 4 an enlarged citizen ot' the United States, residing at Philaview, partly in section, of the riveting-cylindelphia, in the county of Philadelphia and der and piston and valve device in commu- 55 5 State of Pennsylvania, have invented certain nication therewith and with passages leading new and useful Improvements in Rivetingto the minor cylinder and air-supply. Machines, of which the following is a speciln the drawings, B is the framework, of the cation. design usually adopted in portable machines This invention relates to pneumatic rivetof this class, having the power-cylinder A 6o 1o ing-machines in which a power cylinder and and riveting-cylinder 5, with their communipiston and a riveting cylinder and piston are eating parts mounted upon one branch or arm employed that communicate by passages filled of the framework and the anvil C upon the with a liquid and through which the maxiother branch. mum force from the power cylinder piston is In the relative positions of the parts as 65 15 transmitted to the riveting cylinder and pisshown air-pressure is admitted from supplyton, combined with an auxiliary or minor pipe 1 through valve 2 to passage Sinto the cylinder and piston that communicates with push-back chamber 4 of cylinder 5 beneath the air-pressure independent of the power the riveting-piston 6 and raises the piston cylinder and piston and communicates with to its normal vertical position, as shown. 7o zo the riveting cylinder and piston also by pas- This air-pressure is at the same time admitted sages filled with a liquid for transmitting a to the annular air-chamber 7 in front of the lesser degree of force to .bring the rivetingpower-piston head 8 through the port 9 and piston and connected riveting-die in contact located at the rear end of the power-cylinder with the rivet preliminary to the formation A. In this position of the valve 2 the ex- 75 z5 of the rivet-head by the action of the power- `haust-opening to the atmosphere 10 is open piston. to the rear of the power-piston head 8 through The invention also embodies an automatic the passage 11 and to the rear of the iioating valve device that normally cuts 0E the compiston 15 of the minor cylinder14 by the pasmunication between the liquid-chambers of sage 16. The transmitting fluid fills the re- 8o 3o the power-piston and the minor cylinder. spective chambers 28 of the power-piston The valve is opened by the direct pressure trunk and 13 of the minor cylinder 14 and of the power-transmitting liquid in the miall the intermediate passages communicating nor cylinder to permit its flow to the rivetingtherewith, the floating piston 15 of the minor cylinder and by the direct air-pressure acting cylinder being thereby moved to its normal 85 3 5 upon its connected piston to permit its return starting-point, as shown. The operative parts to the minor cylinder. are now in relative position for action. The In order that the invention may be readily valve 2, by means of the hand-lever O, is now understood, I will iirst describe the operation set to register with the supply-pipe port and of the machine embodying it and illustrated the passage 16, leading to the minor cylinder 9c 4o in the accompanying drawings, referring in- 14, and with the exhaust-opening 10 and pascidentally to the parts and constructive desage 3, leading from the chamber '7 in front tails that make up the structure, and subof the power-piston head 8 and from the pushsequently will point out in the appended back chamber 4 beneath the riveting-piston claim the novel characteristics of the inven- 6. The pressure being now applied solely to 95 45 tion. the floating piston 15, the transmitting duid In the drawings, Figure 1 represents a side in front of the same is forced through the elevation of the machine shown partly in secpipe 18, passage 19, check-valve 20, and pastion and with the operative parts in relative sage 21 to the chamber 22 above the rivetingposition at the extreme open stroke of the piston 6 and forces the piston and its con- Ico. 5o riveting-plunger; Fig. 2, a plan view, partly nected riveting-plunger23 in contact with the in section, including the minor cylinder and rivet to be headed. During this preliminary movement of the riveting-piston 6 all communication of the air-pressure with the powerpiston is closed. In this preliminary movement of the piston 6 the air is expelled from the chamber 4 beneath the same through pipe 3 and the exhaust-passage 10. At the same time tne check-valve 2O is closed by the release of the air-pressure from beneath its connected piston 25 and the resilient action of the connected spring 26. The valve 2 is now set to register the pressure-inlet 1 with the port ll, leading to the power-piston head the air being discharged from its front port Q and passage 3 to the exhaust-opening 10, Which is still open. The movement of the piston and trunk Within the power-cylinder A forces the hollow fixed spindle 27 into the trunk Huid-chamber 28 of the piston, and by the displacement of the spindle the fluid is forced through it into chamber 22, which intensities the pressure upon the riveting-piston to form the rivet-head. Following the formation of the rivet-head the valve 2 is set toits rst position, as shown in Fig. l, and the parts are returned to their normal position, as previously described, ready for another operation.

The main essential elements that com prise the machine herein referred to, consisting of the power-cylinder With its chambered trunkpiston and coperating fixed hollovsT spindle and the connected riveting cylinder and piston, together with the minor cylinder and its floating piston, and a valve device that normally closes the liquid communication between the minor cylinder and the power-piston chamber, are also included in a prior application for a patent, led by me December 2l, 1901, Serial No. 86,734, but embodied therein in a differeutstructural relation and cooperation. In the prior application referred to the minor cylinder is arranged parallel with and adjacent to the riveting-cylinder and the interposed valve device located within the extremity of the riveting-cylinder.

compact and stronger construction with inl creased efficiency.

.Having thus fully described my invention,

what I herein claim, and desire to secure by.

Letters Patent, is-

In a riveting-machine, the combination of a frame, apower cylinder and piston forcompressed air, a minor cylinderand floating piston for compressed air, and a riveting cylinder and piston, a Valve for controlling the compressed ai r, a passage for conducting compressed air beneath the riveting-piston for returning the same, and provisions in virtue of which the power-piston and floating piston may act upon the riveting-piston through an interposed liquid medium, said provisions comprising independent passages from the two cylinders to the top of the riveting-cylinder, the passage from the minor cylinder lying partly in the portion of the iframe adjacent to the riveting-cylinder, and a checkvalve for the purpose set forth in said portion of said passage in said portion of theV frame, said check-valve being provided with a motor-piston exposed to the pressure which returns the riveting-piston, substantially as described.

In testimony whereof I afx my signature in presence of two witnesses.

GEORGE E. MARTIN.

l/Vitnesses:

GEo. E. GRoFF, RUDOLPH C. MULLER. 

